QChain makes it possible to install several hotfixes without needing to reboot after each hotfix. Useful when doing a reinstall of everything.

\Q123456_w2k_sp2_x86.exe -z -m
\Q123321_w2k_sp2_x86.exe -z -m
\Q123789_w2k_sp2_x86.exe -z -m
\Qchain.exe

More Info MS KB296723 (About flaw in Pre Win2k SP3 Hotfixes)
More Info MS KB296861
More Info MS KB815062 (About flaw in old version)